Performance Evaluation of Combined Heat and Power Plant Configurations -Thermodynamic Performance and Simplified Cost Analysis

김승진,최상민,Kim, Seungjin,Choi, Sangmin The Korean Society of Combustion 2013 한국연소학회지 Vol.18 No.3

Thermodynamic and economic analyses of various types of gas turbine combined cycle power plants have been performed to establish criteria for optimization of power plants. The concept of efficiency, in terms of the difference in energy levels of electricity and heat, was introduced. The efficiency of power and heat generation by power plants with other purposes was estimated, and power generation costs were figured out for various types of combined heat and power plants(i.e., fired and unfired, condensing and non-condensing modes, single or double pressure HRSG).

AE-MDB 대응을 위한 Side Structure 민감도 분석 및 B-pillar 최적 설계

김승진(Seungjin Kim),양희종(Heejong Yang),박준성(Joonsung Park) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11

This paper presents the optimization of B-pillar structure to meet the Euro NCAP side crash test with AE-MDB. To reduce the occupant injury, vehicle structure and restraint system should be optimized. In the side crash test, B-pillar is one of the main part of load path and main factor to increase the occupant injury. The objective of this paper is structure optimization of the B-pillar to archive high rating in the Euro NCAP side crash test with AE-MDB.

미세먼지 농도에 따른 창문 제어 시스템

김승진(SeungJin Kim),이창한(ChangHan Lee),김용선(YongSun Kim),서동완(DongWan Seo),전휘주(HwiJu Jeon),이승언(SeungEon Lee),장창녕(ChangNyeong Jang),이용준(YongJun Lee),최원근(WonGeun Choi) 대한전기학회 2023 대한전기학회 학술대회 논문집 Vol.2023 No.7

가스 터빈 복합화력 발전 플랜트의 시스템 구성 제안 – CO₂ 포집 대안 별 비교 평가

김승진(Seungjin Kim),최상민(Sangmin Choi) 한국연소학회 2013 KOSCOSYMPOSIUM논문집 Vol.- No.46

In the design of combined cycle power plants, the design parameters considered mainly could be changed and added for performance evaluation with change on the design objective and method. Therefore, the design criteria considering the different objectives and type of power plant were needed. Thermodynamic and economic analyses of various types of gas turbine combined cycle power plants with demand on generation of power and heat and carbon capture system from high pressure flue gas have been performed to establish criteria for optimization of power plants.

Performance Evaluation of Combined Heat and Power Plant Configurations

Seungjin Kim(김승진),Sangmin Choi(최상민) 한국연소학회 2013 한국연소학회지 Vol.18 No.3

Thermodynamic and economic analyses of various types of gas turbine combined cycle power plants have been performed to establish criteria for optimization of power plants. The concept of efficiency, in terms of the difference in energy levels of electricity and heat, was introduced. The efficiency of power and heat generation by power plants with other purposes was estimated, and power generation costs were figured out for various types of combined heat and power plants(i.e., fired and unfired, condensing and non-condensing modes, single or double pressure HRSG).

영재학교 재학생의 영재학교 입학을 위한 사교육 경험 및 이에 대한 인식

김승진(Seungjin Kim),이지원(Jiwon Lee) 한국영재학회 2021 영재교육연구 Vol.31 No.1

이 연구에서는 영재학교 재학생을 대상으로 영재학교 입학을 위한 사교육 경험과 이에 대한 인식을 조사하는 것을 목표로 한다. 이를 위하여 영재학교에 재학 중인 6명의 학생을 대상으로 사교육 참여 경험과 참여 이유, 사교육의 영향력, 공교육에 바라는 바와 영재학교 입학시험이 나아갈 방향에 대한 인식을 포커스 그룹 인터뷰의 형태로 조사 분석하였다. 분석 결과, 영재학교 입시 사교육은 2차 전형 수학에 대비하는 부분이 주를 이루며, 영재학교 입학 대비반 이전 과정으로 고등학교 수학 I, II를 선행하고 해당 과정의 성취도가 높은 학생을 중심으로 영재학교 대비반이 운영되는 것으로 나타났다. 영재학교 입시 사교육에 참여하는 주된 이유는 영재학교 입시에 있어 사교육이 필수적이라는 인식이 주요하게 영향을 미치고 있으며, 이러한 인식은 사교육의 2차 전형에 대한 정보 독점성에 있다고 판단된다. 영재학교 입시 준비의 실제적 수요자인 학생들의 현 영재학교 선발 시스템에 대한 인식을 바탕으로 사교육에의 의존도를 낮추기 위한 공교육의 개선 방안을 논의하였다. This study aims to investigate the experiences and perception of private admission to science academies 6 students enrolled in science academy were surveyed and analyzed in the form of focus group interviews their reasons for private education, and their perception direction the science academy should go. As a result of the analysis , exams mainly preparing for the secondary screening mathematics, and preparatory classes lead to high school mathematics I and II as the preparatory course . Students with high achievements in the course are enrolled in the preparatory classes. The main reason for participating in private education is the recognition that is essential for the entrance examination , and this is to be in the monopoly of information of private education . Based on the students " perception of the current selection system, we discussed ways to improve the quality of public education to lower their dependence on private education.

고감성 의류용 복합사 직물의 수분증기 및 열이동 특성 -실험방법에 따른 수분증기 및 열이동-

김승진 ( Seungjin Kim ),김현아 ( Hyunah Kim ) 한국의류학회 2017 한국의류학회지 Vol.41 No.1

Water vapor and thermal transmission properties of high emotional garments are important to evaluate wear comfort; in addition, the measuring methods of these properties are also critical for breathable and warm suit fabrics. In this study, the water vapor and thermal properties of composite yarn fabrics made of CoolMax, Tencel, and Bamboo fibers with filaments were measured and compared according to the meas-uring method. Water Vapor Transmittance (WVT) of the fabric woven by the sheath/core composite yarn in the warp direction was the highest due to the small staple fiber volume in the sheath/core yarn structure and high air voids in the sheath/core yarn fabrics. This property was also the highest in fabrics woven by bamboo staple yarns in the weft direction, and was the lowest on hi-multi filament fabrics. However, water vapor resistance (R_ef) of these fabrics by KSK ISO 11092 showed the opposite results to the water vapor transmittance method (CaCl₂ method); in addition, its correlation coefficient was low. The correlation coefficient between Ref and the drying rate was 0.719; therefore, the measurement mechanism of R_ef is analogous to the drying property measurement. The thermal conductivity of the fabrics woven with compact staple yarn showed a high value; however, the hi-multi filament fabric showed low thermal conductivity. Therefore, fiber characteristics affect thermal properties more than yarn structure. The correlation between thermal property and moisture transport was also low. This study showed that: water vapor transmittance was active at the loose yarn structure, dry heat transport was vigorous at the compact yarn structure, and heat transport was affected more by fiber characteristics than yarn structure. In conclusion, sheath/core composite yarns were relevant to the high absorptive cool suit along with siro-fil and CoolMax/Bamboo staple yarns that were relevant to the heat diffusive cool suit.

다양한 구성의 가스터빈 복합화력발전소에 대한 열역학적 해석과 경제적 최적화 연구

김승진(Seungjin Kim),최상민(Sangmin Choi) 한국연소학회 2012 KOSCOSYMPOSIUM논문집 Vol.- No.45

Thermodynamic and economic analysis on various type of gas turbine combined cycle power plants was presented to build up the criteria for optimization of power plants. The efficiency considered about energy level difference between electricity and heat was introduced. The efficiency on power and heat generation of power plants whose have different purpose was estimated and power generation costs on various type of combined heat and power plants : fired/ unfired, condensing/ non-condensing mode, single/ double pressure HRSG.

유아 리더십 관련 연구동향 분석: 2004-2018년 국내 학술지 및 학위 논문을 중심으로

김승진(Kim Seungjin),장원호(Jang Wonho) 한국어린이미디어학회 2019 어린이미디어연구 Vol.18 No.2

본 연구의 목적은 유아 리더십교육에 관한 최근 연구동향을 분석하여, 유아 리더십교육의 방향을 모색하는데 있다. 이를 위해 2004년부터 2018년까지 한국연구재단 등재지에 발표된 279편의 논문들을 5년씩 3주기로 구분하였고, 연구주제, 연구유형, 연구대상, 자료수집방법 등의 기준으로 분석하였다. 분석결과를 살펴보면, 첫째 연구주제로 유아 리더십의 영향 관계를 살펴본 연구가 가장 활발히 진행되었다. 둘째, 3기(2014-2018)로 갈수록 유아 리더십의 영향 관계와 프로그램 개발 및 효과에 관한 연구만이 증가하였다. 셋째, 가장 많이 사용된 연구유형은 양적연구, 연구대상은 만 5세 유아, 자료수집방법은 질문지법인 것으로 나타났다. 넷째, 국내 학술 논문과 학위 논문 간의 차이는 연구대상과 자료수집방법측면에서 차이가 있는 것으로 나타났다. 본 연구결과에 근거하여 유아 리더십 교육 연구 활성화를 위하여 유아 리더십과 관련된 질적연구, 비교 문화 연구, 연구 대상을 부모 및 교사로 확대한 연구, 기초연구로서 내용분석법과 면담법을 활용한 연구들의 필요성을 제언하는 바이다. The purpose of this study is to explore the direction of early childhood leadership education by analyzing recent research trends. To this end, 104 academic papers and 175 dissertations, published between 2004 and 2018, were selected as the final analysis targets. The selected papers were also divided into three periods every five years, and analyzed on the basis of research subjects, research types, research subjects, and data collection methods. The results of study are as follows: first of all the study, which examined the impact relationship on the subject of early childhood leadership, was most actively conducted. Second, research changes by study cycle showed a significant increase in the number of studies in the second period (2009-2013) compared to the first period (2004-2008), but the number of studies in the third period (2014-2018) decreased slightly and remained stable. Further, research on awareness and status of education members, exploring the variables related to early childhood leadership, and developing scale decreased as years go by. On the other hand studies on the impact relationship of early childhood leadership and program development of early childhood leadership increased. Third, the most commonly used types of research were quantitative studies, and the most selected research subjects were 5-year-olds, and the most frequently used data collection methods were questionnaires. Fourth, the difference between academic papers and dissertations in Korea has not been confirmed in terms of research subjects and types of research, but there are differences in research targets and methods of data collection. Based on the results of this research, I suggest the need for research using content analysis and interview methods as basic research, qualitative research related to early childhood leadership, cross-cultural studies, and research including subjects expanded to parents and teachers in order to promote early childhood leadership education research.

고감성 의류용 직물의 수분이동특성 -섬유소재와 실 특성 및 실험방법에 따른 수분이동특성-

김승진 ( Seungjin Kim ),김현아 ( Hyunah Kim ) 한국의류학회 2017 한국의류학회지 Vol.41 No.1

Moisture transfer characteristics of high emotional garments are important to evaluate wear comfort. Wic-king and drying measurement methods are also critical for perspiration absorption and quick dry fabric made of high functional fibers. In this study, the wicking and drying properties of high emotional fabrics made from hybrid composite yarns using CoolMax, Tencel, Bamboo staple fibers and PP. PET CoolMax filaments were also measured and analyzed according to various measuring methods. The wicking property of hybrid composite yarn fabrics by Bireck method was mostly influenced by the structure of hybrid yarns than the absorption rate of constituent fibers; however, both the hygroscopicity of fibers and the composite yarn structure affected the wicking property of the fabrics in the drop method. Concerning drying properties, the KSK 0815B method measuring distilled moisture weight was more relevant to explain the drying characteristics of hybrid yarn fabrics than the KSK 0815A method measuring the time to drying. This study revealed that the drying properties of hybrid yarn fabrics were influenced by the hygroscopicity of constituent fibers, wicking properties of constituent yarns and structure of composite yarns.